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摘要
采用添加抗氧剂的方法提高聚乙醇酸(PGA)在二次加工中的热稳定性,通过热重分析、相对分子质量测定、黄度指数测试、力学性能测试等手段,最终确定主抗氧剂2246添加量为2mg/g、辅助抗氧剂THP-24添加量为8mg/g且主辅抗氧剂联合使用时,效果最佳。与未添加抗氧剂的PGA相比,添加复合抗氧剂的PGA样品,其起始降解温度从275℃提高到318℃,相对分子质量保留率由64.02%提高到83.15%,黄度指数从17.23降到10.92,拉伸强度由61.30MPa提高到91.80MPa。
Abstract
Antioxidants were used to improve the thermal stability of the PGA in the process of processing.Though TG,molecular weight determination,yellow degree determination,the main antioxidant of antioxidant 2246 adding amount was 2mg/g (PGA),antioxidants THP-24 as auxiliary antioxidant 2mg/g (mass fraction) were ultimately determined,to achieve the best results.T5% raised temperature from 275℃ to 318℃,the molecular weight retention also increased from 64.02% to 83.15%,the yellow index also dropped from 17.23 to 10.92.The tensile strength increased from 61.30MPa to 91.80MPa.
关键词
聚乙醇酸
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热稳定性
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抗氧剂
Key words
polyglycolic acid
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thermal stability
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antioxidant
抗氧剂对聚乙醇酸热稳定性能的影响[J].
化工新型材料, 2019, 47(8): 197-200 DOI:
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基金资助
国家自然科学基金(21676030)
